package org.monitor.kit;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

public class IPKit {

	public static String getIp(HttpServletRequest request) {
		String ipAddress = null;
		// ipAddress = request.getRemoteAddr();
		ipAddress = request.getHeader("x-forwarded-for");
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getRemoteAddr();
			if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
				// 根据网卡取本机配置的IP
				try {
					Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
					InetAddress ip = null;
					boolean flag = false;
					while (allNetInterfaces.hasMoreElements()) {
						NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
//						System.out.println(netInterface.getName());
						Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
						while (addresses.hasMoreElements()) {
							ip = (InetAddress) addresses.nextElement();
							if (ip != null && ip instanceof Inet4Address) {
								ipAddress = ip.getHostAddress();
								flag = true;
								break;
							}
						}
						if(flag){
							break;
						}
					}
				} catch (SocketException e) {
					InetAddress inet = null;
					try {
						inet = InetAddress.getLocalHost();
						ipAddress = inet.getHostAddress();
					} catch (UnknownHostException e1) {
					}
				}
			}
		}

		// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
															// = 15
			if (ipAddress.indexOf(",") > 0) {
				ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
			}
		}
		return ipAddress;
	}
	
	public static int getPort(HttpServletRequest request){
		return request.getLocalPort();
	}

}
